I.1. Changes from 2.7.3 to 2.7.4

scripts/systemd/nut-server.service.in: Restore systemd relationship since it
was preventing upsd from starting whenever one or more drivers, among several,
was failing to start

Fix UPower device matching for recent kernels, since hiddev* devices now have
class "usbmisc", rather than "usb"

macosx-ups: the "port" driver option no longer has any effect

Network protocol information: default to type NUMBER for variables that are
not flagged as STRING . This point is subject to improvements or change in
the next release 2.7.5. Refer to docs/net-protocol.txt for more information